The OpenStorage plugin developed by DataDomain requires access to UDP port 111 and TCP 2049 (default port) on target DataDomain array. If there is a firewall separating the media server and target storage server, these ports need to be opened. Else optimized duplications to the target storage server will fail with status 83.

I created new storage unit for that and created new CIFS share path for that in datadomain and it shows path exists in datadomain box.But unable to see the properties of that disk which created in netbackup.

Is there a reason you're setting this up to use a CIFS share, and not straight to OST?

Backing up the VM's in the manner you are attempting will mean that 100% of the VMDK images traverse the network from your Media Server to your Data Domain. If you configure OST, and enable ddboost distributed segment processing will enable the media server to process the deduplication work, and improve the network utilization.

Backups are IT-101 (Do Backups) Doing Backups well is an art form. Nobody cares about getting their data backed up... They only care that you can restore it for them!